Stationary induction electrical apparatus

Abstract

A stationary induction electrical apparatus includes a disc winding having a structure in which a flow path for a cooling medium is provided between coils where a low voltage is generated between shield wires, an L-shaped insulation barrier is provided between coils where a high voltage is generated between the shield wires, a horizontal portion of the L-shaped insulation barrier is provided so as to closely contact an upper surface or a lower surface of the disc coil, a tip end portion in an axial direction of the L-shaped insulation barrier is provided so as to closely contact an inner surface of the disc coil which is adjacent to a pressboard insulation cylinder, and a height of the tip end portion in the axial direction is lower than a thickness of one coil.

What is claimed is: 
     
       1. A stationary induction electrical apparatus including a disc winding in which plural disc coils provided with a plurality of electric wires wound in a helical manner on the same plane in a circumferential direction are stacked in an axial direction of a pressboard insulation cylinder, coils in which an inter-coil spacer is arranged between the disc coils are provided, a shield wire of a certain-ordinal layer in the axial direction and shield wires of a fourth, sixth layers counted from the shield wire among shield wires wound with plural turns between wires of respective disc coils are connected by a crossover line for shielding, and a high voltage and a low voltage are alternately generated between adjacent shield wires arranged in the axial direction, the apparatus comprising:
 a flow path for a cooling medium provided between coils where a low voltage is generated between shield wires; and 
 an L-shaped insulation barrier provided between coils where a high voltage is generated between the shield wires, 
 wherein a horizontal portion of the L-shaped insulation barrier is provided so as to closely contact an upper surface or a lower surface of the disc coil, 
 a tip end portion in the axial direction of the L-shaped insulation barrier is provided so as to closely contact an inner surface of the disc coil which is adjacent to the pressboard insulation cylinder, and 
 a height of the tip end portion in the axial direction is lower than a thickness of one coil.